package com.example.douyin.filter;

import com.example.douyin.entity.LoginUser;
import com.example.douyin.utils.JwtUtil;
import com.example.douyin.utils.RedisCache;
import io.jsonwebtoken.Claims;
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import java.io.IOException;
import java.util.Objects;

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {
	@Autowired
	private RedisCache redisCache;

	@Override
	protected void doFilterInternal(HttpServletRequest request,
	                                HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
		//获取token
		String token = request.getHeader("token");
		if (!StringUtils.hasText(token)) {
			//放行
			filterChain.doFilter(request, response);
			return;
		}
        //解析token
		String userid;
		try {
			Claims claims = JwtUtil.parseJWT(token);
			userid = claims.getSubject();
		} catch (Exception e) {
			e.printStackTrace();
			throw new RuntimeException("token非法");
		}

        //从redis中获取用户信息
		String redisKey = "login:" + userid;
		LoginUser loginUser = redisCache.getCacheObject(redisKey);
		if (Objects.isNull(loginUser)) {
			throw new RuntimeException("用户未登录");
		}

        //存入SecurityContextHolder
		//获取权限信息封装到Authentication中

		System.out.println(loginUser.getAuthorities());
		System.out.println(loginUser);

		UsernamePasswordAuthenticationToken authenticationToken =
				new UsernamePasswordAuthenticationToken(loginUser, null, loginUser.getAuthorities());
		SecurityContextHolder.getContext().setAuthentication(authenticationToken);
        //放行
		filterChain.doFilter(request, response);
	}
}
